The answer appears to be no. You can get apps such as shutter snitch that allow you to download the photos using WIFi but it doesn't do camera control.

Using the WFT5A wireless file transmitter in ad hoc mode (I.e. it is a wireless standalone node) and forcing the iPad onto the same network with a static ip address may work using the wireless file transfer server mode which This article on cpn implies should allow you to control the camera using a web browser as long as it supports JavaScript.

Off to find out if the safari browser on ios5 on the ipad3 supports js ...

YES!

Apple Support says just enable js on safari from settings menu for safari.

I've been looking for a reason to buy a wft - now all I have to do is figure out the wife factor after spending over $1000 on building a new workstation.

But the first app requires having a computer tethered to the DSLR. What I'm looking for is to replace tethered shooting in the field with just an iPad. In other words having the iPad connect to the camera directly and have it able to adjust focus via the live view display with zoom, set the aperture, shutter speed etc. lock the mirror up and fire the shutter.

It looks like the only way of doing this might be from a WFT acting as a web server and using the safari browser on the iPad. I'll have to see if I can get my hands on a WFT either from a retailer or CPS to try it out.

I purchased a wft-e5a for my eos 7d and have been testing it out. The wft (wireless file transfer) mode Appeared to have promise but is not the killer app i've been looking for. Though it does create a web server that can view the live viewm output and does have focus control it does not allow zooming in to accurately check focus like the EOS utility does. So while I can connect to it from an iPhone or iPad and take images and copy them to the devices the lack of zoom for focus limits the use ability.

Information on the wireless file transmitters is spotty and Canon's lack of on-line manuals is perplexing but a fairly decent article on the modes is available on the CPN Europe site[/u]

The EOS utility mode works really well both wired and wireless in infrastructure and ad-hoc modes but still requires a laptop to run the software and the same functionality can be obtained without spending the $ on a wft just by tethering with a USB cable.

There is a software development kit for the canon dslrs so perhaps some day some one will create an app to either tether from a tablet or use a wireless connection to allow using a larger screen to see the live view images and zoom in to get critical focus.